Utilizing published and unpublished sources and working with interviews of a number of participants this thesis examines the evolution of the political influences that stimulated the Australian federal government's policy decisions on public broadcasting. The background to the federal government's original involvement in broadcasting in the early years of the twentieth century is investigated to put later developments into a broader perspective. Comparisons are also drawn with progress in other comparable Western countries to highlight the unique nature of the Australian model. Since broadcasting was never an issue, like health and education, which could capture votes from the electorate as a whole, government policy was driven by pressure from particular special interest groups as their influence waxed and waned and calls from individual electorates, when the interest was strong and the seat was marginal. The government decisions that resulted from this situation were ad hoc and expedient and no really coherent policy was ever implemented. This thesis examines the forces that led to the restriction in the expansion of broadcasting services after World War 2 and to the change in the influence of pressure groups in the 1960s which led to the establishment of FM and public broadcasting in the 1970s. A detailed exploration of particular interests, such as the Public Broadcasting Association of Australia, educational broadcasters and ethnic broadcasters shows how the influence of different groups changed over time. Once public broadcasting was established the main concern of both broadcasters and government was to keep the sector economically viable. A detailed analysis is provided of how the funding arrangements altered as the sector grew. There were always some idealists who saw public broadcasting as a vehicle for putting forward their own point of view. But, this thesis concludes that, by the early 1990s, apart from its role as regulator, which was the same for commercial broadcasting, government policy on public broadcasting was largely driven by the fact that minimal funding for the sector enabled government to ensure that essential non-commercially viable broadcasting services that would be far more expensive for the government to provide itself, were able to continue.